A saturable absorber, coherent population oscillations, and slow light

Semiconductor Saturable Absorber Mirror (SESAM)

Multisoliton regime of pulse generation by lasers passively mode locked with a slow saturable absorber

The passively mode-locked laser1–5 has been a muchstudied device in recent years. Ultrashort-pulse generation in laser systems makes use of a variety of schemes, including figure-of-eight fiber laser design,1 fast saturable absorbers,4 additive-pulse mode locking,5 and nonlinear polarization rotation.6,7 The use of a semiconductor saturable absorber mirror8 with a relatively slow response time ...

Saturable Absorber Mirrors For Passive Mode-locking

Saturable absorber mirrors (SAMs) are grown by low-temperature solid-source molecular beam epitaxy. The nonlinear absorber layer consists of one InGaAs quantum well. The devices have response times shorter than 10 ps and small non-saturable losses (less than 0.3%). SAMs with modulation depths between 0.6% and 2.0% were used to mode lock a Yb:KYW laser at around 1040 nm. The minimum achievable p...

Room temperature slow light in a quantum-well waveguide via coherent population oscillation.

We report room temperature demonstration of slow light propagation via coherent population oscillation (CPO) in a GaAs quantum well waveguide. Measurements of the group delay of an amplitude modulated signal resonant with the heavy-hole exciton transition reveal delays as long as 830 ps. The measured bandwidth, which approaches 100 MHz, is related to the lifetime of the photoexcited electron-ho...

Sevoflurane Induces Coherent Slow-Delta Oscillations in Rats

Although general anesthetics are routinely administered to surgical patients to induce loss of consciousness, the mechanisms underlying anesthetic-induced unconsciousness are not fully understood. In rats, we characterized changes in the extradural EEG and intracranial local field potentials (LFPs) within the prefrontal cortex (PFC), parietal cortex (PC), and central thalamus (CT) in response t...